September weather forecast
Saint-Denis, Reunion

September, the first month of the spring in Saint-Denis, is still a warm month, with an average temperature ranging between max 25.8°C (78.4°F) and min 18.6°C (65.5°F).

Temperature

In Saint-Denis, the average high-temperature in September is practically the same as in August - a still warm 25.8°C (78.4°F). The average low-temperature, in Saint-Denis, is 18.6°C (65.5°F).

Rainfall

In Saint-Denis, during 8.1 rainfall days, 50mm (1.97") of precipitation is typically accumulated. In Saint-Denis, during the entire year, the rain falls for 119.3 days and collects up to 1659mm (65.31") of precipitation.

Sea temperature

The months with the coldest seawater in Saint-Denis, Reunion, are August and September, with an average sea temperature of 23.8°C (74.8°F).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.8°C (74.8°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In Saint-Denis, the average length of the day in September is 11h and 59min.
On the first day of the month, sunrise is at 06:27 and sunset at 18:09. On the last day of September, sunrise is at 06:00 and sunset at 18:16 +04.

Sunshine

The average sunshine in September is 7.1h.

UV index

In September, the average daily maximum UV index is 10. A UV Index of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 10 in September interpret into the following advice:
Take special precautions, as unprotected skin can be damaged and can burn quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.